import java.util.Scanner;
public class Main {
public static void main(String[]args){
Scanner sc =new Scanner(System.in);
int num=0;
while(sc.hasNext()){
int sum=0;
double a=sc.nextDouble();
String s=String.valueOf(a);
char[] str =s.toCharArray();
for(int i=0;i<s.length();i++)
{ if(str[i]=='-'||str[i]=='.')continue;
else{
num=str[i]-'0';sum+=num;
}
}
System.out.println(sum);
}
}
}
